i'm gwen ifill. outsiders and tea-party backed candidates posted victories in key primaries around the country yesterday. >> brown: and i'm jeffrey brown. on the newshour tonight. our political editor david chalian reviews the winners and losers. >> ifill: then, a roundtable of political strategists explains what the results mean for republicans, for democrats and how they will affect who controls congress. >> brown: ray suarez talks to mexican ambassador arturo sarukhan as his country celebrates its bicentennial and fights an all-out war against drug-trafficking. >> as mexico seeks to shut down the flow of drugs moving north, the united states needs to step up to the plate and shut down the flow of weapons and cache moving >> ifill: plus, jose luis sierra of new america media reports on how the drug war has affected the tourism and manufacturing industries in the mexican state of baja california. >> we want to get back to getting people to think about mexico as fun in the sun and margaritaville and